Expansion-anchor.



J. KENNEDY. EXPANSION ANCHOR. APPLIOATION FILED JULY 20,1912.

1, 1 00,661 Patented June 16, 1914.

ZWITNESSES I zy ATTORNEY NTTED STATES PATENT OFFICE.

JOSEPH KENNEDY, OF NEW YORK, N. Y., ASSIGNOR TO THE CLEMENTS COMPANY, ACORPORATION OF NEW YORK.

EXPANSION-ANCHOR.

Specification of Letters Patent.

Patented June 16, 1914.

Application filed July 20, 1912. Serial No. 710,589.

To all whom it may concern:

Be it known that I, JOSEPH KENNEDY, a citizen of the United States, anda resident of the city, county, and State of New York, have inventedcertain new and useful Improvements in Expansion-An chors, of which thefollowing is a specification, reference being had to the accompanyingdrawings forming a part thereof.

My invention relates to improvements in expansion anchors of thecharacter employed for obtaining anchorage in brick or stone walls orthe like, of which the material is of a character not adapted todirectly receive and hold a threaded bolt.

A feature of the present invention contemplates in addition to theprovision of a longitudinally segmental anchor having its outer surfacecorrugated or ribbed for a portion of its length which makes it betteradapted to engage the sides of the hole in the wall when forced apart byits expander, the construction of the anchor which provides for the boltwhich is used with it acting upon an expander and also engaging theinner end of the anchor itself in the manner which is illustrated in theaccompanying drawings which I describe in the following specificationand the novel features of which I will set forth in appended claims.

Referring to the drawings :Figure 1 is a side elevation of an anchorconstructed in accordance with my invention together with a bolt. Fig. 2is a transverse vertical section of the same parts taken on the line 22of Fig. 1 and drawn on a somewhat larger scale. Fig. 3 is a centrallongitudinal elevation of the bolt and anchor with the an chor and itsexpander shown in section, the view being taken at right angles to thatshown in Fig. 1. Fig. 4 is a transverse vertical section on an enlargedscale taken on the line 44 of Fig. 3. Fig. 5 is a central longitudinalsection showing the anchor expanded. Fig. 6 is a side elevation on anenlarged scale of a conical expanding member or nut.

Like characters of reference designate corresponding parts in all of thefigures.

The anchor comprises a shell divided longitudinally throughout itslength into two parts 10 and 11. This shell has a longitudinal bore ofwhich the forward portion 12 is cylindrical and smooth and but slightlygreater than the diameter of the bolt which is to be used therewith. Atthe inner end of this cylindrical part of the bore is a portion 14 whichmay be conical with its sides diverging from the end of the cylindricalportion toward the inner or rear end of the anchor. The anchor or largerend of this conical portion 14 is joined with a shallow beveled recess15 formed in the inner end wall 16 of the anchor. Through the end ofthis end wall a hole 17 is provided which is somewhat smaller than thediameter of the bolt.

At the line of joinder of the two parts of the shell the inner portionof it is provided with a pair of substantially diamond shaped recesses19. These recesses are adapted to receive correspondingly shaped ears orlu s 20 which project laterally from the perip 1- ery of a nut 21 whichin this case is conical and is adapted to be held within the conicalbore 14. This nut and its lugs 20 are of such size and shape that theyallow the two parts 10 and 11 of the shell to lie together beforeexpansion. The sides of the lugs 20 are undercut as shown at 22. This isfor the purpose of preventing the sides of the shell at recesses 19being pushed out over the lugs by lateral bending. In fact this construction gives the metal of the shell a tendency to grip the lugs of theexpander more tightly and to prevent loss of expansion due to thespreading of the sides of the shell. This feature is set forth andclaimed in my copending application Serial No. 696,675 filed May 11,1912, and is not an essential part of my present invention. The nut 21is threaded to receive a bolt 23.

In use a hole is drilled in the wall or other structure of sufiicientsize to permit the insertion of the anchor. The bolt is then screwedinto the nut 21 and through it until it engages the rigid inner end wall16 of the shell. A further rotation of the bolt forces the nut forwardand as the lugs 20 prevent the expanding nut from turning theirwedge-like or tapered form causes the desired expansion to be effected.When the the inner ends of the two parts of the shell bending in towardeach other, thereby providing a holding bearing at the rear end of theshell and establishing a bearing against the surfaces of the hole in thewall throughout the length of the shell. As soon as the nut has advanceda sufficient amount to ob-.

tain :a holding effect of the shell upon the wall, the .bolt may beadvanced through the nut to tighten any object which may be between thehead of the bolt and the surface of the wall, against such surfacewithout the necessity of having any thrust bearing upon the outer end ofthe shell. If such parts become loose, a further turning of the boltwill produce a further expansion to obtain a new hold upon the surfaceof the hole and to again tighten the object.

If desired the end walls may be made beveled as shown so that thepressure of the end of the bolt against them also tends to force the twoparts of the shell apart. The corrugations on the outside of the shellpre sent a .rough surface which .aids in preventing the withdrawal ofthe anchor from the wall especially when the device is used incomparatively soft material such as brick or concrete.

What I claim is l. A bolt anchor comprising a tubular shell splitlongitudinally, an internally threaded longitudinally movable expanderwithin said shell, and rigid members integral with the parts of saidshell forming a transverse bearing surface, said members beingconstructed to form a central opening smaller than the bolt which is tobe used with said anchor, the sides of said opening forming bearingsurfaces for the bolt after the parts of'the shell are expanded.

2. A bolt anchor comprising a tubular shell split longitudinally, aninternallyi threaded longitudinally movable expander within said shell,means for preventing rotation of said expander relative to the shell,and rigid members integral with the parts- :of the shell forming atransverse bearing inner end of the shell near the end of said pocket,said members being constructed to form a central opening smaller thanthe bolt which is to be used with said anchor, the sides of said openingforming bearing surfaces for the bolt after the parts of the shell areexpanded; an internally threaded expander in said pocket, andwedge-shaped lugs projecting transversely from opposite sides of theexpander through the sides of the shell.

4. Abolt anchor comprising a tubular shell split longitudinally, saidshell being constructed with a conical pocket flaring toward the innerend of the shell, rigid members integral with the parts of said shellforming a bearing surface across the inner end of the shell near the endof said pocket, said members being constructed to form a central openingsmaller than the bolt which is to be used with said anchor, the sides ofsaid opening forming bearing surfaces for the bolt after the parts ofthe shell are expanded; an internally threaded expander in said pocketand wedge-shaped lugs projecting transversely from opposite sides of theexpander through the sides of the shell.

5. A bolt anchor comprising a tubular shell split longitudinally, saidshell being constructed with a pocket, and a pair of opposed aperturesfrom said pocket through the sides of the shell at the division linesthereof, said apertures having converging walls, rigid members integralwith the parts of said shell formingabearing surface across the innerend of the shell near the end of said pocket, said members beingconstructed to form a central opening smaller than the bolt which is tobe used with said anchor, the sides of said opening forming bearingsurfaces for the bolt after the parts of the shell are expanded; aninternally threaded expander in said pocket, and a pair of wedge-shapedlugs forming bearing surfaces projecting transversely from oppositesides of the expander into said apertures.

6. The combination with a bolt anchor comprising a tubular shell splitlongitudinally, said shell being constructed with a conical pocketflaring toward the inner end of the shell, and a pair of opposedsubstantially diamond-shaped apertures from said pocket through theshell at the division lines thereof, rigid integral members projectinginwardly to form a beveled bearing surface across the inner end of theshell, said members being constructed to form a central opening smallerthan the bolt which is to be used with said anchor, the sides of saidopening forming bearing surfaces for the bolt after the parts of theshell are expanded; an internally threaded expanding member of conicalexterior within said pocket having diamond-shaped lugs forming bearingsurfaces entering sa-ic apertures and adapted to pass through theopening in said a portion protruding beyond the outer end Wall When theanchor is expanded, and corof the shell. 10 rugat-ions on the outerperiphery of the In Witness whereof, I have hereunto set shell; of abolt having the threaded portion my hand this 19th day of July 1912.

thereof passing through and fitted into the JOSEPH KENNEDY. threadedportion of the expander and pro- WVitnesses:

jeoting beyond the expander into contact ELIZABETH ALEXANDER,

with the said rigid members and having I. B. MOORE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner 01' Patents, Washington, D. G.

